Motion in the Universe
4 marks · EasyThe table below shows the gravitational field strength on the surface of different planets:
| Planet | Gravitational field strength (N/kg) |
|---|---|
| Earth | 10 |
| Mars | 4 |
| Jupiter | 23 |
| Venus | 9 |
Which planet has the strongest gravitational field strength?
A 60 kg object is placed on Mars. Calculate its weight on the surface of Mars.
Explain why the weight of an object on Jupiter is more than that on Earth.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Jupiter
(b) 240 N · must show Correct formula used (weight = mass × gravitational field strength)
(c) Jupiter has a larger gravitational field strength than Earth, so the same object experiences a greater force (weight) on Jupiter. · must show Greater gravitational field strength, Weight depends on gravitational field strength
Common mistakes: Confusing mass and weight; Not using correct gravitational field strength
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly identifies Jupiter as having the strongest gravitational field strength.
M1 (b) · 1 mark · Uses weight = mass × gravitational field strength.
A1 (b) · 1 mark · Correct answer: 240 N with correct unit.
B2 (c) · 1 mark · Explains weight is greater because gravitational field strength is higher on Jupiter.
Worked solution
a) Jupiter has the greatest gravitational field strength (23 N/kg).
b) Weight = mass × gravitational field strength
c) Jupiter’s gravitational field strength is higher than Earth’s, so an object weighs more on Jupiter.